age = int(input('input your age:'))
if age >= 18:
    print('成年了：',age)
elif age < 0:
    print('不存在这个年龄',age)
else:
    print('未成年：',age)


print("Calculate BMI ")
height = int(input("input your height:"))
weight = int(input("input your Weight:"))

bmi = weight/(height*height)

if bmi < 18.5:
    print("过轻")
elif bmi < 25:
    print("正常")
elif bmi < 18:
    print("过重")
elif bin < 32:
    print("肥胖")
else:
    print("严重肥胖")
